Water Mains Commissioning Engineer

We’re looking for a Water Mains Commissioning Engineer to join our Severn Trent Water Framework

Location: Derby, with hybrid working across site, office and home.

Benefits: Company car/allowance, enhanced annual leave entitlement, and a range of family-friendly policies and benefits.

You’ll be responsible for the commissioning of new and replacement potable water mains, including LDTM, coordinating commissioning plans, flushing strategies and assurance activities to safely bring assets into operation. You’ll work closely with project teams, client operations, water quality, network control, hydraulic specialists and subcontractors.

Key Responsibilities:

Prepare and maintain commissioning plans, method statements, test sheets, flushing plans, contingency arrangements and handover records.

Undertake and coordinate swabbing, pressure testing, chlorination, de-chlorination, flushing, sampling, water quality monitoring and completion of commissioning records.

Condition existing mains to accommodate new flows or changes in flow direction.

Plan, coordinate and assure pressure tests, including test boundaries, test pressures, calibrated instrumentation, acceptance criteria, witnessing, recording and management of test failures.

Plan and deliver disinfection and flushing activities, including dosing, contact periods, target velocities and volumes, neutralisation, discharge locations, sampling requirements, consents and pollution prevention controls.

Confirm construction and installation readiness before commissioning, including inspections, permits, isolations, temporary works, access arrangements and supporting quality records.

Prepare commissioning RAMS and review contractor commissioning RAMS for technical adequacy and readiness, with formal approval completed through the relevant company and project arrangements.

Use hydraulic information and work with specialists to confirm commissioning flows, pressures, network constraints, discharge arrangements and possible impacts on customers and the live network.

Set, test and prove mains assets, including line valves, air valves, hydrants, washouts, flowmeters, instrumentation, PRVs, PSVs and flow control valves.

Coordinate network control approvals and operational requirements before new mains are brought into service, including contingency planning where required.

Act as a key commissioning contact, lead or support commissioning meetings and clearly record decisions, actions, responsibilities and changes.

Keep programme and completion information up to date, report progress, risks, delays and dependencies, and share lessons learned and good practice across the Commissioning team.

Skills & Experience

Practical experience commissioning potable water mains and distribution networks, ideally within the water industry.

Strong knowledge of pressure testing, swabbing, chlorination, flushing, sampling and water quality verification.

A recognised pressure testing and disinfection qualification, with knowledge of Type 2 pressure testing of PE mains.

Experience safely bringing new or modified mains into service on live operational networks.

Ability to develop commissioning plans, methodologies, flushing strategies and completion documentation.

Good understanding of hydraulic systems, pressures, flow rates, valves and associated network equipment.

Able to work effectively with project, operational, water quality, hydraulic and subcontractor teams.

EUSR National Water Hygiene and SHEA Water, or willingness to obtain, alongside a relevant CSCS card and full UK driving licence.

Experience of large-diameter mains, LDTM, Severn Trent Water procedures, telemetry or wider network assets would be beneficial.

A recognised safety qualification such as SSSTS, SMSTS or IOSH Managing Safely.

This role is not eligible for sponsorship under the Skilled Worker Visa process. Applicants must therefore have, and maintain, an alternative right to work for the duration of employment.

What’s in it for you?

25 days holiday plus bank holidays

Company car or allowance

Company pension scheme

Life assurance

Private GP Helpline & Health Cash Plan

Avove Discount Scheme

Family friendly policies

A selection of lifestyle benefit options

Financial wellbeing programme

Employee assistance program for health and wellbeing and onsite mental health first aiders to support our colleagues

We love to give back so we offer you volunteering days in your community and charity matched giving where we will boost your fundraising.

Why join Avove?

At Avove, we’re proud to create an environment where people can build meaningful careers, develop their skills and feel supported to reach their full potential. We invest in training and development, provide opportunities to grow, and are committed to a workplace where safety, wellbeing and collaboration are at the heart of everything we do. With a strong focus on supporting our people and their families through a broad range of benefits, Avove is a place where you can feel valued, make a real impact and take the next step in your career with confidence.

About Avove

Avove is a leading infrastructure services provider, delivering critical utility and energy solutions across the UK. With a strong focus on safety, sustainability, and innovation, we specialise in the design, maintenance, and renewal of essential infrastructure for water, energy, and telecoms networks. Our people are at the heart of everything we do, and we are committed to long-term investment in training, development, and modern equipment to support our teams in delivering high-quality, reliable services for our clients and communities.

We are an equal opportunities employer

At the heart of what we do is a commitment to equity, diversity, and inclusion. We celebrate what makes each of us unique and are building a workplace where everyone feels safe, valued, and empowered to be their authentic selves. If you require any reasonable adjustments or support during the application or interview process, please let us know and we’ll be happy to discuss how we can support you.